I saw a video of a judge that had to send the defendant into another courtroom, then they let him watch on TV and they would turn his mic on to answer questions and then just turn it off when he went a ramblin'.
I mean, that's effective... but imagine the memes of Trump in a ball gag...
(on second thought, don't...I regret everything.)
Actually, that'd be a good set up for debates. put them in sound proof boxes so neither candidate can interfere if the mic is 'Off'. The other thing is, the mic gets sent to two channels, one of which is used to give subtitles, so we can still see the crazy.